5/22
Get on down

6/22
All join in

7/22
One of the crowd

Taylor Swift was surrounded by dancers in colourful outfits as she opened her set with the single 22

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Pals

Swift invited surprise guest Ed Sheeran to join her on the stage, describing him as "one of my absolute best friends in the world" before they performed their duet Everything Has Changed

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9/22
She's all white

Ellie Goulding on stage at Wembley

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Make some noise

Will.i.am takes to the stage

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11/22
Move it

Rizzle Kicks keep things going at Wembley

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Headliner

Robbie Williams wowed the Wembley crowd

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Jumping jack

Olly Murs leaps in the air at the Summertime Ball

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Boy band

Max George (left) and Jay McGuiness of The Wanted on stage at Wembley

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15/22
London calling

Justin Timberlake emerges from a phone box to host the show

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Playing host

Timberlake wowed the crowd with an acoustic medley of classic tunes and some of his own most popular tracks. He sang Ain't No Sunshine When She's Gone and the Elvis Presley hit Heartbreak Hotel, as well as Cry Me A River

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Getting his groove on

Max George gets down at the Summertime Ball

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Golden girl

Eliza Doolittle on stage

19/22
Perfect pout

The Saturdays pout for the camera

20/22
Sing it out

Ellie Goulding sings her heart out

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Peace out

Psy in his usual quirky style at the Capital ball

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Packed

Tom Parker from The Wanted on stage

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The Wanted singer Nathan Sykes made a surprise appearance at Wembley after recovering from throat surgery to save his voice.

The 20-year-old, who went under the surgeon's knife in Los Angeles in April, joined his bandmates to open the Capital FM Summertime Ball.

Speaking after coming off stage, Sykes joked that he would miss watching daytime television and playing computer games. "I'm going to miss my days of Jeremy Kyle, This Morning and the Playstation, but it is great to be back," he said.

One of the highlights of the event was when South Korean rapper Psy was joined by the 80,000-sell out crowd in dancing to his single Gangnam Style.

"It's my lifetime biggest hit ever and I think it's going to be for ever, he said. "Until the day I retire I've got to do that horsey thing," he explained.

But he added that wearing just a waist coat and trousers was a mistake. "How come it's so cold in here in summer? They are saying it's the Summertime Ball, so I dressed like summer but it's really cold," he added.

Robbie Williams was the headline act, with Taylor Swift, Will.i.am, Jessie J, The Saturdays, Labrinth and Olly Murs also performing.

US star Justin Timberlake hosted the event.

Meanwhile The Saturdays declared their love for summer just before stepping onto the stage wearing revealing outfits.

Vanessa White said "literally no one wears any clothes" and Una Healy added: "Tops come off."